Gadget Guide: Get into your circadian rhythm

Withings photo

The system's bedside light changes color and monitors room temperature, light and noise. A sleep sensor, not shown, is tucked under the mattress and helps detect the best time of your sleep cycle to wake you. The system works with a smartphone to graph the information it collects. $189.95 at Withings.com

This 9-watt LED bulb produces as much light as a 65-watt incandescent. But it reduces blue light by 50 percent to encourage the production of melatonin, which is used by the body to regulate one's circadian rhythm. $39.95 at Hammacher.com

While sleep doctors warn against the use of smartphones and TVs in the bedroom, they do support some tech devices aimed at improving your sleep.

“They are useful for tracking the amount of sleep, quality of sleep and changes in patterns,” said Phyllis Zee, director of the Sleep Disorders Center at Northwestern Memorial Hospital. “I recommend them to patients and friends because these monitors can help motivate healthy sleep behaviors.”

Click through to see gadgets that could be helpful on your nightstand. — Blue Sky